package net.zigin.nhi.could.waste.shiro;


import net.zigin.nhi.could.waste.service.SysUserService;
import net.zigin.nhi.could.waste.util.JWTUtil;
import net.zigin.nhi.could.waste.vo.SysUserVo;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MyRealm extends AuthorizingRealm {


    private SysUserService userService;

    @Autowired
    public void setUserService(SysUserService userService) {
        this.userService = userService;
    }

    /**
     * 大坑！，必须重写此方法，不然Shiro会报错
     */
    @Override
    public boolean supports(AuthenticationToken token) {
        return token instanceof JWTToken;
    }

    /**
     * 只有当需要检测用户权限的时候才会调用此方法，例如checkRole,checkPermission之类的
     * todo 未做权限验证
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        String username = JWTUtil.getUserAccount(principals.toString());
        SysUserVo user = userService.getUserByUserAccount(username);
        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
        return simpleAuthorizationInfo;
    }

    /**
     * 默认使用此方法进行用户名正确与否验证，错误抛出异常即可。
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken auth) throws AuthenticationException {
        String token = (String) auth.getCredentials();
        // 解密获得username，用于和数据库进行对比
        String userAccount = JWTUtil.getUserAccount(token);
        if (userAccount == null) {
            throw new AuthenticationException("token invalid");
        }

        SysUserVo userVo = userService.getUserByUserAccount(userAccount);
        if (userVo == null) {
            throw new AuthenticationException("User didn't existed!");
        }

        if (! JWTUtil.verify(token, userAccount, userVo.getPassword())) {
            throw new AuthenticationException("userAccount or password error");
        }

        return new SimpleAuthenticationInfo(token, token, "my_realm");
    }
}
